Adhesive joint.



C. C. BLAKE.

ADHESIVE JOINT.

APPLICATION FILED Nov. 13. 1915.

Patented Nov. 12, 1918.

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fnwewfor ED STATES PATENT FFTQ,

CHARLES C. BLAKE, 0F BROOKLINE, MASSACHUSETTS, ASSIGNOR TO'C. C. BLAKE, INCORPORATED, OF BOSTON, MASSACHUSETTS, A CORPORATION OF NEW YORK.

ADHESIVE Jom'r.

Specification of Letters Patent.

Patented Nov. 1L2, 19118.

Application filed November 13, 1915. Serial No. 61,382.

To all whom it may concern."

Be it known that I, CHARLES C. BLAKE, a citizen of the United States, residing at Brookline. inthe county of Norfolk and State of Massachusetts, have invented a new and useful Improvement in Adhesive Joints, of which the following is a specification.

The present invention relates to adhesive joints by means of which separate pieces of material are connected.

In the adhesive joint devised by me one of the pieces to be joined is coated with a normally cold adhesive in which a wire of heat-producing resistance is embedded. When the other piece of material is pressed against the coated face of the first piece a current of electricity is passed through the wire. The wire soon becomes red hot thereby rendering the adhesive tacky and sticking the pieces of material together. As

the wire employed is very fine for many uses it may remain in the joint with safety. For other purposes it may be desirable or expedient to remove the wire from the joint.

The object of the present invention is the production of an adhesive joint from which the source of heat may be removed without afiecting the joint.

To the accomplishment of this object,'and such others as may hereinafter appear, the features of the present invention relate to certain devices, combinations and arrangements of parts, hereinafter described and then set forth broadly and in detail in the appended claims, which possess advantages readily apparent to those skilled in the art.

The various features of the present invention will be best understood from an inspection of the accompanying drawings illustrating the best form of the invention at present known to the inventor, in which,

Figure 1 is a plan of an insole for a welt shoe which is to be connected to an upper;

Fig. 2 is a lateral sectional elevation of an insole having a groove formed along its edge face;

Fig. 3 is a similar view showing the groove filled with a normally cold adhesive and having a wire embedded therein; and

Fig. 4 is a lateral sectional elevation of a lasted weltshoe.

Referring now to the drawings an insole 1 is provided with a groove 2 (Fig. 2) along its edge face which is filled with a coating 3 of jewelers cement, sealing wax or some other of the well known normally non-tacky adhesives all of which are non-conductors. Embedded in this coating is a conductor L (Fig. 1) hereinafter termed a thermal conductor, for transmitting force, such as heat or electricity. While the thermal conductor may be a tube for transmitting steam, hot air or other heating medium it is preferred to employ a wire of heat-producing resistance for conducting electricity. The insole is secured to a last in the usual way, or in accordance with the method described in application for Letters Patent of the United States filed by me September 16, 1915, Se-

' rial No. 51,099, and an upper 5 is then updrawn in the manner illustrated in Fig. 4:. The updrawn upper is then firmly pressed against the grooved edge face of the insole and a current of electricity passed through the wire 4. As the wire has a high resistance it soon becomes red hot whereupon the coating 3 is rendered tacky thus making a tight joint between the insole and upper. With this adhesive joint the heat is applied directly to the contacting faces of the parts to be joined thus obviating all danger of I damage resulting to the material of the parts. While the adhesive is hot the wire may be withdrawn without afl ecting the joint between the upper and insole.

While the illustrated embodiment of the present invention is directed to an improved adhesive joint for connecting the upper and sole of a shoe it is not to be understood as limiting the scope of the claims, where the context otherwise permits, to the exclusive use of the adhesive joint in the manufacture of shoes as it will be apparent to those skilled in this and other arts that the adhesive joint herein disclosed may be advantageously employed in the manufacture of many kinds of articles.

It will be clear to those skilled in this art and with the general objects of the present invention in view, that changes may be made in the details of structure, the described and illustrated embodiment thereof being intended as an exploitation of its underlyin essentials, the features whereof are definite y stated in their true scope in the claims herewith.

What is claimed as new, is 1. In combination, two members having v a naeaaeo interposed'therebetween an, adhesive which ranged normal to the parallel faces of the is normally non-adhesive but which is reninsole, substantiall as described.

dered tacky under the influence of heat, and" 4. A sole provi ed with a groove in its 20 a thermal conductor for heating the adedge face, an adhesive filling which is'nor- 5 hesive and removable from between the mally non-adhesive but which is rendered members while the adhesive is hot, substantacky under the influence of heat in the tially as described. groove, and a thermal conductor embedded 2. A sole provided with a groove formed 7 1n the adhesiveand arranged longitudinally 25 in its edge face, an adhesive filling which of the groove, substantially as described.

10 is normally non-adhesive but which is ren- 5. Anadhesive joint comprising two de'red tacky under the influence of heat in members having an adhesive between their the groove, and a thermal conductor emcontacting faces and a heating element bebedded in the adhesive, substantially as detween the members for heating the adhesive 30 scribed. and removable from between the members I 15' '3. An insole having a longitudinal groove while the adhesive is hot, substantially as formed along the median line of its edge described, face which is straight vertically and ar- 

